THE CYOLOPHORTD LAJSTD MOLLUSKS OF AMERICA 117 



The unique type, Acad. Nat. Sci., Philadelphia, No. 101141, is 

 without specific locality, bearing merely the label "Jamaica." It has 

 4.5 whorls and measures: Height, 9.7 mm.; greater diameter, 14.0 

 mm.; lesser diameter, 10.9 mm. 



This species is easily separated from all the other Cyclobakerias as 

 it has none of the zigzag sculpture characterizing the group. 



POTERIA (CYCLOBAKERIA) NOVAESPEI (Chitty) 



Plate 16, Figubes 13-15 



1857. Cyclotus novae-spei Chittt, Proc. Zool. Soc. London, vol. 25, p. 148. 

 1898. Neocyclofiis (Plectocijclotus) novae-spei Kobelt and Mollendorff, Nachrb. 

 deutschen malak. Ges., vol. 29, p. 138, reprint. 



Shell of medium size, helicoid, covered by a chestnut-brown perio- 

 stracum. The nucleus consists of a single well-rounded, smooth turn. 

 The postnuclear whorls are inflated, strongly rounded; the first 2 

 postnuclear whorls are marked by feeble, hairlike, slightly retrac- 

 tively curved axial riblets. After this the axial riblets become less 

 regular and wavy, owing to the additional sculpture. Beginning 

 with the third postnuclear whorl irregular wrinkles make their 

 appearance. These are most strongly emphasized near the suture 

 and weakened toward the middle of the turn. There are also indica- 

 tions of spiral threads and pits. The suture on all but the last whorl 

 is strongly impressed; on the last it is rendered less conspicuous by 

 the fact that the summit of this whorl creeps up materially on the 

 preceding turn, to which it is appressed. Periphery well rounded. 

 Base inflated, strongly rounded, openly, moderately broadly umbili- 

 cated with a very strong lamellar keel at the outer limit of the um- 

 bilicus. The space immediately below this keel, within the umbilicus, 

 is strongly excavated, while on the outside there is a strong impres- 

 sion. Tlie base itself is marked by low zigzag wrinkles, which are 

 strongest near the umbilical keel and fade toward the periphery. At 

 the umbilical keel the spaces between these ridges are deeply im- 

 pressed pits. The umbilical wall is marked by obsolete riblets and 

 numerous hairlike incremental lines. Aperture circular, protracted 

 into an angle at the posterior angle; the outer lip of the peris- 

 tome thin, the inner somewhat thickened. Operculum typically 

 cyclobakerid. 



The specimen figured, Acad. Nat. Sci. Philadelphia, No. 174154, is 

 one of three collected by H. B. Baker at Negril Hills, southwest of 

 Retreat, Westmoreland Parish, Jamaica. It has 5 whorls and 

 measures: Height, 16.2 mm.; greater diameter, 22.1 mm.; lesser 

 diameter, 16.3 mm. 



The species is confined to the southwestern coastal region of 

 Westmoreland Parish. 



